Inhaltsbereich
Determination of single-crystal elastic properties of olivine and serpentine as a function of chemical composition at conditions of subduction zones up to 25 GPa, 1000°C
The project involves sound velocity measurements of antigorite and olivine by Brillouin scattering at high-pressures and high-temperatures using resistively-heated diamond-anvil cells; with a focus on the study of elastic anisotropy (fig.) and its implications for the interpretation of geophysical observations. Our results will provide for the first time experimental information about the combined effect of temperature, pressure and composition on the elastic anisotropy of the most abundant mineral of the upper mantle, and its most common alteration product.
© GFZ Potsdam- High-pressure Brillouin spectrum collected in the ~(010) plane of antigorite. Inset shows the antigorite sample loaded in a diamond-anvil cell. The approximate direction of the wave-vector corresponding to the probed phonon direction is indicated by the arrow. Acoustic velocity measurements in this particular crystallographic plane provide important constraints on the antigorite-related seismic anisotropy expected in subduction zones.
Contact: Sergio Speziale, Hauke Marquardt